The best replacement for slip on is full exhaust.

The best alternatives to slip on are rated as following:
★★★★★  full exhaust
★★★★★  full system
★★★  lace up
★  bolt on
★  full exhaust motorcycle
★  lap joint flange
★  weld neck
★  pull ups
★  full system exhaust
  complete exhaust
  full exhaust system
  exhaust
  socket weld flanges
  lap joint
  new exhaust

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Speaking about slip on, one probably shouldn't forget about power commander.

Other search terms related to slip on and their ratings are:
★★★★★ power commander
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slip on
full exhaust
full system